Smoothing-planes



UNITED STATES PATENT OFFICE.

JOHN F. W. ERDMANN, OF PHILADELPHIA, PENNSYLVANIA.

STOCK FOR lSIlVlOOTHINGf-Il?LANES.

Specification of Letters Patent No. 17,921, dated August 4, 1857.

To all whom t may concern:

Be it known that I, J. F. W. ERDMANN, of Philadelphia, county ofPhiladelphia, in the State of Pennsylvania, have invented a new anduseful Improvement in Smoothing-Planes; and I do hereby declare that thefollowing isa full and eXact description thereof, reference being had tothe accompanying drawings and to the letters of reference markedthereon.

The nature of my invention consists in certain improvements ashereinafter described in smoothing (or scraping) planes for the use ofcabinet makers and others.

To enable others skilled in the art to make and use my invention I willproceed to describe its construction and operation, reference being hadto the accompanying drawings, where- Figure 1 represents a longitudinalsection; Fig. 2, a side elevation; Fig. 3, an end elevation; Fig. 4, atop view of plane stock;

Fig. 5, side and edge views of plane iron, and Fig. 6, side and edgeviews of wedge.

The stock (A) is constructed as that of the ordinary smoothing planewith the eX- ception of the mortise for the bit (B) being made with areversed inclination to that usually given.

The plane rim or bit (B) is constructed as shown with two working endsor four cutting edges which may be used alternately until all requiresharpening.

(O) is the wedge which is constructedso that it may be applied eitherbefore or behind the bit (B) which is perfectly plain on its sides.

(D) is an elastic strip inserted in the back of the stock at the throatand against which ment of the four edged scraping bit (B) in theordinary smoothing plane stock, an eficient and economical tool is made,which may be constructed to adapt itself to every variety of work, whileby constructing the same as described the cutting angle of the bit maybe varied by simply shifting the wedge (O) from one to the other side ofthe said bit, always pressing the said bit firmly against the elasticstrip (D), which latter effectually prevents any shaving from enteringthe throat of the plane back of the iron, and also makes the plane workmore easily, and satisfactorily from the fact of making the iron veryslightly elastic.

I am aware that an iron similar to mine is known as a scraper and thatirons have been adjusted in stock, with mechanisms for changing thecutting (or scraping) angle and do not wish therefore to be understoodas claiming such features as my invention, but

Having described the construction of my improved plane what I claim asmy invention and desire to secure by Letters Patent 1s:-

Placing in the throat of the plane back of the iron, the elastic strip(D) substantially as and for the purposes described.

In testimony whereof I have hereunto set my hand this 28th day of May,1857.

JOHN FR. W. ERDMANN.

Witnesses:

D. MAJOR GoDwIN, WM. T. GoDwiN.

